ComiXology has a lot of Tom King stuff on sale for up to 66% off. You can get Batman, The Omega Men, Mr. Miracle, The Sheriff of Babylon, Swamp Thing Winter Special, and one issue of Kamandi Challenge for great prices.
I picked up the two TPB collecting the 12 issues of The Sheriff of Babylon for $10 ($5 each) and The Swamp Thing Winter Special for 84 cents (cover price is $7.99).
https://www.comixology.com/comics-sale?list_id=28863&lang=1&28863_pg=1&cu=0